Engine cooling device



June 18, 1935. w, F DAVE, v 2,005,336

I ENGINE COOLING DEVICE I Filed Dec. 18, 1931 ATfoRNEYs Patented June18, 1935 UNITED STATES PATENT OFFICE- ENGINE COOLING DEVICE N. Y., acorporation of Delaware Application December 18, 1931, Serial No.581,851

4 Claims.

This invention relates in general to air cooling systems for internalcombustion engines and more particularly to the construction of bafliestherefor.

It is an object of the invention to provide a simple and efficientbaffle to control the passage of air around the engine cylinders forcooling purposes.

It is another object to provide such a baflle which is also easilyattachedand detached.

It is a further object to provide such a baflle which will alsocooperate, by reason of its design and place of attachment, with theengine cowling and the cylinder cooling fins to provide a Venturi effectand insure accelerated fiow of air and thorough contact thereof with theouter walls of the cylinders.

With the foregoing and other objects in view, the invention consists inthe combination of after set forth in the following description andappended claims, certain embodiments thereof being illustrated in theaccompanying drawing, in which:

Figure 1 is a view in side elevation of an inverted internal combustionengine showing the cylinders, theircooling fins and bafiles.

Figure 2 is a view in longitudinal cross-section along line 22 of Figure1 taken through the cylinders, the bafiies and the engine cowling,showing the cowling on the exhaust side and the baflles on the intakeside of the cylinders.

Figure 3 is a similar view with the baflles arranged on theexhaust sideand the cowling on 35 the intake side of the cylinders. I

) Referring more particularly to the drawing,

the particular engine shown in Figure 1 for purposes of illustration isa six cylinder inverted and in line aeronautical engine, the crankcasebeing indicated at I, the camshaft housing at 2 and the cylindersextending therebetween. The cylinders are cast separately and arrangedin line and are spaced from each other and are provided with suitablecooling fins cast thereon.

45. Figure 1 shows me cooling baiiles, one being placed between eachcylinder and the cylinder adjacent.

Referring to Figure 2, a bafile 5 of light metal having a curved backand inwardly curved ends 60 A and B is placed so as to rest upon thelateral cooling fins 3' and 4 of cylinders 3 and 4 so as to overlap thespace therebetween. This baflle is retained in this position by means of,a hook 6 attached thereto for engagement by a tension 65 spring 1 whichengages a hook 8 on a small piece parts and in the details ofconstruction herein-.

9 which may fit between two lateral fins of the cylinders 3 and 4, thefins tending to keep the piece in position and the tension of the springtending to keep the baffle in position. The arrangement of the otherbafiies is similar 8 throughout the engine.

In the arrangement shown' in Figure 2, the baifies are all arranged onthe intake side of the engine, the exhaust pipes being shown at Hadjacent the exhaust ports, the intake ports 10 (not shown) beingsubstantially at the opposite side of the cylinder from the exhaustports and pipes. It will be appreciated that any suitable type of enginecowling, such as that represented at iii, may be employedto properly di-15 vert the incoming air in the direction indicated by the arrows. Inthis instance, the cowling is arranged on the exhaust side opposite thebafiles. The incoming air being confined by the cowling is forcedagainst the exhaust side of the cylinder walls and also between thecylinder walls. However, the path of least resistance for the air is toflow in a straight line and therefore it is necessary to provide someinduction system for the air in order to insure'a free flow of airbetween the adjacent cylinder walls. This is accomplished by the baflieswhich, due to their curved backs and inwardly curved ends, produce anair passageway of such a nature between the baflle resting on thelateral cooling fins and the actual cylinder wall that a Venturi effectis obtained. This Venturi effect in causing an accelerated air fiow hasbeen found to be an efficient air induction system for insuring the aircooling of the adjacent cylinder walls.

The arrangement just described has been found to be so efficient that itmay in'practice be found desirable to employ the arrangement shown inFigure 3. In this arrangement bafiles 5 are arranged on the exhaust sideof the space 40 between cylinders 3 and 4 while the cowling i0 isarranged onthe intake or other side of the engine over the space betweencylinders 3 and 4. Obviously the exhaust side of the cylinder issubjected to'the greater degree of heat. However by either of thearrangements shown in Figures 2 and 3, the efficiency of air cooling ofthe adjacent cylinder walls is obtained. The matter of preferencebetween the two arrangements lies only in the question of cooling theexhaust side of the cylinders.

The same bafiie and Venturi effect may be carried out for the front sideof the front cylinder and the rear side of the rear cylinder. A Venturieffect is provided for the passage of air around the front side of thefront cylinder and suitable baiiie I2 curved, as indicated in Figures 2and 3, to a part or the engine, such as the front oil drain pipe H. Therear end of the cowling .l3 may also be curved to produce a Venturiefiect for the air passing around the rear side of the rear cylinder.

I claim:

1. In an internal combustion engine having spaced cylinders providedwith lateral cooling fins, an air cooling baflle detachably secured soas to rest upon said fins and to overlap the space between adjacentcylinders, said plate being curved at both ends and capable of producinga Venturi effect on the air passing between the plate and both ofsaidadjacent cylinder walls, resilient detachable retaining means for saidplate extending between said cylinders.

2. In an internal combustion engine having spaced cylinders providedwith lateral cooling fins, an air cooling bafile detachably secured soas to rest upon said fins and to overlap the space between adjacentcylinders, said plate being curved and capable of producing a Venturieffeet on the air passing between the plate and the side walls of saidadjacent cylinders, retaining means for said plate including a clipadapted to rest between the cooling flns on the opposite side of saidcylinders and a tension element between said plate and clip.

3. In an internal combustion engine having spaced cylinders each ofwhich is provided with substantially lateral cooling fins, a cowling forsaid engine arranged on the exhaust side of said cylinders, bafliesarranged between the adjacent cylinder walls and resting on said fins,said baffles having their vertical ends curved inwardly and away fromsaid cylinders, so as to provide an air passageway having thecharacteristics of a venturi to provide a means of accelerating theairflow between said adjacent cylinder walls.

4, In air-cooled engines, a bafiling means bearing on the enginecylinders and extending across the inter-cylinder spaces to direct airto the lee .vard sides of said cylinders, and a member bearing on theopposite sides of said cylinders, and fastened to said baflling meansfor clamping the complete assembly in position.

WALTER F. DAVIS.

